fix: v2.5.9 — Vietnamese in the terminal on macOS, every slash command, the right Claude account

Issue #62: a tmux client whose LC_ALL/LC_CTYPE/LANG names no UTF-8 prints `_`
for every non-ASCII character, and a macOS LaunchAgent starts the dashboard
with no locale at all — Vietnamese text and Claude Code's logo came out as
underscores in every browser terminal.

- shell-path.js: ensureUtf8Locale() defaults LC_CTYPE (en_US.UTF-8 on macOS,
  C.UTF-8 elsewhere) at start, before any tmux call; an explicit LC_ALL and
  Windows are left alone
- RunSetup.tsx: the `/` list now offers Claude Code's bundled skills
  (/code-review, /security-review, /simplify, /loop…) and newer built-ins, and
  every enabled plugin's commands and skills as /<plugin>:<name>
- Claude login decided by the TOKEN's owner (GET /api/oauth/profile, cached
  per token), not by .claude.json: a running session can leave the
  credentials store holding one account's token under another account's
  name. The Profiles modal, its Check quota and the status-bar quota now show
  the account requests are really billed to and warn on the mismatch; a
  switch saves the outgoing token into its OWNER's profile (credentials only)
  instead of overwriting the profile .claude.json names; saving a profile
  while they disagree is refused (EMISMATCH); a saved profile holding another
  account's token reports EWRONGACCOUNT instead of that account's usage
- Running Claude Code sessions follow a switch on their own (they re-read the
  credentials store when it changes), so the "close your sessions first"
  warning is gone

client/src/components/run/RunSetup.tsx

@@ -47,12 +47,15 @@ import { isSubmitEnter } from "../../lib/keys";
 
 export interface SlashCommand {
   name: string;
-  source: "project" | "user" | "builtin";
+  source: "project" | "user" | "plugin" | "builtin";
   description?: string;
 }
 
-// Commands the CLI answers itself. They are typed into the pane like any
-// other text, so they do run — they are just not files anyone can list.
+// Commands the CLI answers itself, and the skills bundled inside it. They are
+// typed into the pane like any other text, so they do run — they are just not
+// files anyone can list.
+// ponytail: a hand-kept list, so it lags new Claude Code releases; no file or
+// API lists the built-ins, add names here as they ship.
 const BUILTIN_SLASH_COMMANDS: SlashCommand[] = [
   "help",
   "clear",
@@ -62,6 +65,8 @@ const BUILTIN_SLASH_COMMANDS: SlashCommand[] = [
   "memory",
   "hooks",
   "cost",
+  "usage",
+  "context",
   "agents",
   "review",
   "permissions",
@@ -69,14 +74,36 @@ const BUILTIN_SLASH_COMMANDS: SlashCommand[] = [
   "init",
   "mcp",
   "plugin",
+  "reload-plugins",
+  "skills",
   "output-style",
+  "resume",
+  "rewind",
+  "add-dir",
+  "doctor",
+  "export",
+  "login",
+  "logout",
+  "statusline",
+  "theme",
+  "fast",
   "exit",
+  "code-review",
+  "security-review",
+  "simplify",
+  "loop",
+  "schedule",
+  "fewer-permission-prompts",
+  "update-config",
+  "claude-api",
+  "run",
 ].map((name) => ({ name, source: "builtin" }));
 
-const SOURCE_ORDER = { project: 0, user: 1, builtin: 2 } as const;
+const SOURCE_ORDER = { project: 0, user: 1, plugin: 2, builtin: 3 } as const;
 const SOURCE_TONE: Record<SlashCommand["source"], string> = {
   project: "text-status-success border-status-success/40",
   user: "text-accent border-accent/40",
+  plugin: "text-accent border-accent/40",
   builtin: "text-fg-muted border-border",
 };
 
@@ -185,8 +212,26 @@ export function PromptEditor({
     Promise.all([
       api.ccConfig.commands(undefined, fileCwd).catch(() => ({ items: [] as CcMdItem[] })),
       api.ccConfig.skills(undefined, fileCwd).catch(() => ({ items: [] as CcMdItem[] })),
-    ]).then(([c, sk]) => {
-      if (live) setCommands([...c.items, ...sk.items].map(toCmd).concat(BUILTIN_SLASH_COMMANDS));
+      api.ccConfig.plugins().catch(() => ({ plugins: [] })),
+    ]).then(([c, sk, pl]) => {
+      // A plugin's commands and skills are addressed as `/<plugin>:<name>`; one
+      // installed at both user and project scope is listed once.
+      const fromPlugins = pl.plugins
+        .filter((p) => p.enabled !== false && p.contributes)
+        .flatMap((p) =>
+          [...p.contributes!.items.commands, ...p.contributes!.items.skills].map(
+            (it): SlashCommand => ({
+              name: `${p.name}:${it.name}`,
+              source: "plugin",
+              description: it.description || undefined,
+            })
+          )
+        )
+        .filter((cmd, i, all) => all.findIndex((o) => o.name === cmd.name) === i);
+      if (live)
+        setCommands(
+          [...c.items, ...sk.items].map(toCmd).concat(fromPlugins, BUILTIN_SLASH_COMMANDS)
+        );
     });
     return () => {
       live = false;

client/src/components/run/__tests__/RunSetup.test.tsx

@@ -59,6 +59,25 @@ vi.mock("../../../lib/api", async (importOriginal) => {
         skills: r({
           items: [{ scope: "user", name: "review-pr", frontmatter: {}, preview: "Review a PR" }],
         }),
+        plugins: r({
+          plugins: [
+            {
+              name: "vercel",
+              enabled: true,
+              contributes: {
+                items: {
+                  skills: [{ name: "deploy", description: "Deploy to Vercel" }],
+                  commands: [],
+                },
+              },
+            },
+            {
+              name: "off",
+              enabled: false,
+              contributes: { items: { skills: [{ name: "deployer" }], commands: [] } },
+            },
+          ],
+        }),
       },
     },
   };
@@ -96,6 +115,9 @@ describe("PromptEditor — / and @ suggestions", () => {
     expect(options.map((o) => o.textContent)).toEqual([
       expect.stringContaining("/review"),
       expect.stringContaining("/review-pr"),
+      // Claude Code's bundled skills, matched on a word of their name.
+      expect.stringContaining("/code-review"),
+      expect.stringContaining("/security-review"),
     ]);
     fireEvent.keyDown(box(), { key: "ArrowDown" });
     // Read for the directory the session will start in, not the server's own.
@@ -108,6 +130,13 @@ describe("PromptEditor — / and @ suggestions", () => {
     expect(spies.onSubmit).not.toHaveBeenCalled();
   });
 
+  it("offers enabled plugins' skills under their plugin's name", async () => {
+    renderEditor("");
+    fireEvent.change(box(), { target: { value: "/deplo" } });
+    const options = await screen.findAllByRole("option");
+    expect(options.map((o) => o.textContent)).toEqual([expect.stringContaining("/vercel:deploy")]);
+  });
+
   it("suggests files under the folder on @", async () => {
     vi.mocked(api.run.files).mockResolvedValue({ items: ["src/main.ts"] });
     // The prompt is controlled by the caller: put the cursor at the end of it.